/* Install Banners */
        .install-banner {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 12px 15px;
            z-index: 1001;
            box-shadow: 0 2px 10px rgba(0,0,0,0.2);
            animation: slideDown 0.3s ease;
            display: none;
        }

        .install-banner.ios {
            background: linear-gradient(135deg, #000000 0%, #434343 100%);
        }

        .install-banner.show {
            display: block;
        }

        .banner-content {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 14px;
        }

        .banner-icon {
            font-size: 32px;
            flex-shrink: 0;
        }

        .banner-text {
            flex: 1;
            line-height: 1.4;
        }

        .banner-text strong {
            display: block;
            font-size: 15px;
            margin-bottom: 2px;
        }

        .banner-text small {
            display: block;
            opacity: 0.9;
            font-size: 12px;
        }

        .install-btn {
            background: white;
            color: #667eea;
            border: none;
            padding: 8px 16px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 13px;
            white-space: nowrap;
            cursor: pointer;
            flex-shrink: 0;
        }

        .close-btn {
            background: none;
            border: none;
            color: white;
            font-size: 24px;
            padding: 0;
            width: 30px;
            height: 30px;
            cursor: pointer;
            flex-shrink: 0;
        }

        /* iOS specific */
        .share-icon {
            display: inline-block;
            font-weight: bold;
            font-size: 16px;
            padding: 2px 6px;
            background: rgba(255,255,255,0.2);
            border-radius: 4px;
            margin: 0 2px;
        }

        .ios-steps {
            margin-top: 8px;
            padding: 8px;
            background: rgba(255,255,255,0.1);
            border-radius: 8px;
            font-size: 12px;
        }

        .ios-step {
            display: flex;
            align-items: center;
            gap: 8px;
            margin: 4px 0;
        }

        .step-number {
            background: rgba(255,255,255,0.2);
            width: 20px;
            height: 20px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 11px;
            flex-shrink: 0;
        }

        @keyframes slideDown {
            from { 
                transform: translateY(-100%); 
                opacity: 0;
            }
            to { 
                transform: translateY(0); 
                opacity: 1;
            }
        }

        body.install-banner-visible {
            padding-top: 75px;
        }

        body.install-banner-visible.ios {
            padding-top: 140px;
        }

        /* Demo content */
        .demo-content {
            padding: 20px;
            margin-top: 20px;
        }

        .browser-info {
            background: #f5f5f5;
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 20px;
            font-family: monospace;
            font-size: 12px;
        }